A German chef visiting New York claims he suffered a dining nightmare at fiery British restaurateur Gordon Ramsay’s eatery at The London hotel — biting into a burger that contained a sharp ceramic shard.

Markus Barthel, 28, is suing Ramsay in Manhattan Supreme Court for the unappetizing episode. Last March, he was having lunch at the West 54th Street eatery and “suffered serious injuries that rendered him unable to continue working . . . as a professional chef,” his suit says.